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/*
* sb-math-test.cpp - some std functions to work with (pw)s-basis
*
* Authors:
* Jean-Francois Barraud
*
* Copyright (C) 2006-2007 authors
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*/
#include <2geom/sbasis-math.h>
#include <2geom/piecewise.h>
#include <2geom/d2.h>
#include <2geom/sbasis.h>
#include <2geom/bezier-to-sbasis.h>
#include <2geom/path.h>
#include <toys/path-cairo.h>
#include <toys/toy-framework-2.h>
#define ZERO 1e-3
using std::vector;
using namespace Geom;
using namespace std;
#include <stdio.h>
#include <math.h>
#include "pwsbhandle.cpp" // FIXME: This looks like it may give problems later, (including a .cpp file)
//-Plot---------------------------------------------------------------
static void plot(cairo_t* cr, double (*f)(double), Piecewise<SBasis> const &x, double vscale=1){
int NbPts=40;
for(int i=0; i<NbPts; i++){
double t=double(i)/NbPts;
t=x.cuts.front()*(1-t) + x.cuts.back()*t;
draw_handle(cr, Point(150+i*300./NbPts,300-(*f)(x(t))*vscale));
cairo_stroke(cr);
}
}
static void plot(cairo_t* cr, Piecewise<SBasis> const &f,double vscale=1){
D2<Piecewise<SBasis> > plot;
plot[1]=-f;
plot[1]*=vscale;
plot[1]+=300;
plot[0].cuts.push_back(f.cuts.front());
plot[0].cuts.push_back(f.cuts.back());
plot[0].segs.emplace_back(Linear(150,450));
cairo_d2_pw_sb(cr, plot);
for (unsigned i=1; i<f.size(); i++){
cairo_move_to(cr, Point(150+f.cuts[i]*300,300));
cairo_line_to(cr, Point(150+f.cuts[i]*300,300-vscale*f.segs[i].at0()));
}
}
double my_inv(double x){return (1./x);}
#define SIZE 4
class SbCalculusToy: public Toy {
PWSBHandle pwsbh;
void draw(cairo_t *cr, std::ostringstream *notify, int width, int height, bool save, std::ostringstream *timer_stream) override {
//Let the user input sbasis coefs.
cairo_move_to(cr, Geom::Point(0,300));
cairo_line_to(cr, Geom::Point(600,300));
cairo_set_line_width (cr, 1);
cairo_set_source_rgba (cr, 0.2, 0.2, 0.2, 1);
cairo_stroke(cr);
Piecewise<SBasis> f = pwsbh.value(300);
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, .8);
plot(cr,f,1);
cairo_stroke(cr);
/* cairo_set_source_rgba (cr, 0.3, 0.3, 0.3,.8);
plot(cr,abs(f),1);
cairo_stroke(cr);
cairo_set_source_rgba (cr, 0.3, 0.3, 0.3,.8);
plot(cr,signSb(f),75);
cairo_stroke(cr);*/
// cairo_set_source_rgba (cr, 0.3, 0.3, 0.3,.8);
// plot(cr,maxSb(f, -f+50),1);
// cairo_stroke(cr);
// cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 1);
// plot(cr,sqrt(abs(f),.01,3),10);
// plot(cr,&sqrt,abs(f),10);
// cairo_stroke(cr);
// cairo_set_source_rgba (cr, 1.0, 0.0, 0.0, 1);
// plot(cr,cos(f,.01,3),75);
// plot(cr,&cos,f,75);
// cairo_stroke(cr);
// cairo_set_source_rgba (cr, 0.9, 0.0, 0.7, 1);
// plot(cr,sin(f,.01,3),75);
// plot(cr,&sin,f,75);
// cairo_stroke(cr);
cairo_set_source_rgba (cr, 0.9, 0.0, 0.7, 1);
plot(cr,divide(Linear(1),f,.01,3),2);
plot(cr,&my_inv,f,10);
cairo_stroke(cr);
Toy::draw(cr, notify, width, height, save,timer_stream);
}
public:
SbCalculusToy() : pwsbh(4,1){
for(int i = 0; i < 2*SIZE; i++)
pwsbh.push_back(i*100,150+150+uniform()*300*0);
handles.push_back(&pwsbh);
}
};
int main(int argc, char **argv) {
init(argc, argv, new SbCalculusToy);
return 0;
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype = cpp:expandtab:shiftwidth = 4:tabstop = 8:softtabstop = 4:encoding = utf-8:textwidth = 99 :
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